Cross-Flow Filtration

Bhave, Ramesh R.

doi:10.1016/b978-1-4557-2553-3.00009-x

Cited by 4 publications

(3 citation statements)

References 27 publications

(32 reference statements)

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“…Like flux, protein rejection was not constant during the course of filtration, but rather, decreased gradually, except for pure membranes where the correlation was reversed (Figure a). In theory, for common membrane filtrations, membrane rejection increases gradually during the process without any disruptions, due to the increases in resistances to mass transfer from factors such as filtration cake and pore blocking . This trend can be seen in the results for pure membranes (PV0 and PES0) which are functionally common filtration membranes.…”

Section: Resultsmentioning

confidence: 94%

“…A further mechanism that can produce a reduction in rejection with time is the increase in flux of molecules which can occur during concentration polarisation, where the build‐up of molecules near the surface of the membrane forms a boundary layer of higher concentration, which can gradually provide a higher driving force for solution diffusion . This however may be a lesser mechanism in this case because the tangential flow stream usually reduces the effects of concentration polarisation through pushing material away from the membrane surface . It has also been previously reported that concentration polarisation is an unlikely flux‐altering mechanism in wine filtration …”

Section: Resultsmentioning

confidence: 99%

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Towards continuous wine fining: Materials characterisation and crossflow performance testing of polymer–bentonite mixed matrix membranes

Shi

Burmeister²,

Frost³

et al. 2017

Asia-Pacific J Chem Eng

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This study investigates the feasibility of using bentonite-embedded mixed matrix membranes to perform wine fining on white wines to eliminate protein instability. Membranes made using polyethersulphone or polyvinylidene fluoride were fabricated using the wet phase inversion technique and used to filter unfined New Zealand Sauvignon Blanc wine in a crossflow filtration system.The morphologies of all the fabricated membranes were characteristic of asymmetric phase inversion membranes. Confocal laser scanning microscopy analysis on the membranes suggests that the two major mechanisms of protein removal are adsorption by the embedded bentonite particles and size exclusion via the membrane morphology. Polyethersulphone membranes were found to produce wine of similar levels of protein stability (around 90% protein removal) and polyphenol content as polyvinylidene fluoride membranes of the same membrane composition and operating conditions but with as much as 80% higher flux. Stabilising wine in one filtration pass was possible with polyethersulphone membrane with 25 wt% bentonite while maintaining high flux. These promising results show that the tested process has the potential to replace the current batch-wise fining process with continuous crossflow membrane filtration with benefits such as increased processing speed and reduced wine loss.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Towards continuous wine fining: Materials characterisation and crossflow performance testing of polymer–bentonite mixed matrix membranes

Shi

Burmeister²,

Frost³

et al. 2017

Asia-Pacific J Chem Eng

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“…where q ″ represents the heat flux per unit length, whilst T w , T b , T i , and T o represent the wall, bulk, inlet, and outlet temperature, respectively. Accordingly, the hydraulic diameter of the annular channel and the average Nusselt number can then be computed utilizing Equation (11) and Equation (12), respectively [57]. The hydraulic diameter can be defined as the characteristic diameter of noncircular conduits, typically as a ratio of the cross-sectional area and the wetted perimeter, whereas the Nusselt number is dimensionless and is often defined as the ratio of convective heat transfer to conductive heat transfer.…”

Section: Data Reductionmentioning

confidence: 99%

Thermohydraulic and Irreversibility Analyses of Swirl Flows Utilizing Distorted Radial Fins: Entropy Generation and Entransy Dissipation Evaluation

Ho,

Tan,

Hung

et al. 2023

International Journal of Energy Research

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The current investigation analyses the convective heat transfer performance, entropy generation, and entransy evaluation of swirl flows generated by distorted radial fins (DRF). As swirl flows and various vortical structures induce large temperature gradients, second law and entransy analyses are necessary to thoroughly evaluate their true thermodynamic influence on heat transfer enhancement. The results indicated that due to the influence of swirl flows and vortices, all angles of the DRF were capable of inducing intense fluid mixing, thinner thermal boundary layers, and turbulent eddies. It was found that overaggressive swirl flows may hinder local heat transfer performances, by enclosing low-velocity heated fluids within the thermal boundary layers. However, as these overaggressive swirl flows and strong vortices propagate downstream, beneficial fluid mixing was eventuated, favouring heat transport over large regions. In terms of thermal performances, the maximum heat transfer enhancement was exhibited by the α=45° DRF, improving the Nusselt numbers up to 59.3%. Accordingly, the highest performance evaluation criterion (PEC) of 1.269 was obtained by the α=45° DRF at the Reynolds number 2389, attributed to the centrifugal effects of the swirl flows. Optimal entropy generation numbers were also exhibited by the α=45° DRF at the highest studied Reynolds number, reducing total entropy generation by 36.81%. Lower entransy thermal resistances were also accredited to greater DRF angles due to the intense swirl effects. In essence, the study concludes that the effects of swirl flows and vortices significantly enhance heat transfer, whilst reducing both entropy generation and entransy dissipation rates, leading to optimal thermal performances.

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Enhancing separation performance of thin film nanocomposite membranes by self-etching of polydopamine-modified calcium carbonate during interfacial polymerization process

Wei,

Wang,

Fan

et al. 2024

Journal of Membrane Science

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Cross-Flow Filtration

Cited by 4 publications

References 27 publications

Towards continuous wine fining: Materials characterisation and crossflow performance testing of polymer–bentonite mixed matrix membranes

Towards continuous wine fining: Materials characterisation and crossflow performance testing of polymer–bentonite mixed matrix membranes

Thermohydraulic and Irreversibility Analyses of Swirl Flows Utilizing Distorted Radial Fins: Entropy Generation and Entransy Dissipation Evaluation

Enhancing separation performance of thin film nanocomposite membranes by self-etching of polydopamine-modified calcium carbonate during interfacial polymerization process

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